Add github action to shellcheck master on push and PRs

.github/workflows/shellcheck.yml

@@ -0,0 +1,24 @@
+---
+name: Shellcheck
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  shellcheck:
+    name: Check shell scripts
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install dependencies
+        run: |
+          sudo apt update && sudo apt install -y shellcheck
+
+    - name: shellcheck
+      run: |
+        git grep -l '^#!\(/bin/\|/usr/bin/env \)\(sh\|bash\|dash\|ksh\)' | xargs shellcheck